You are unable to crawl the data in the share regardless of the NTFS or share permissions you set on the directory.
To resolve this issue, assign the Manage Auditing And Security Log permission to the SharePoint 2013 crawler. To do this, follow these steps on the computer that hosts the file shares:
- Click Start, click Run, type gpedit.msc, and then click OK.
- Navigate to the following location in the Local Group Policy Editor:Computer Configuration\Windows Settings\Security Settings\Local Policies\User Rights Assignment
- In the right pane, locate and right-click Manage auditing and security log, and then click Properties.
- Click the Add User or Group button in the Manage auditing and security log properties dialog box, and then add the crawl account that the SharePoint 2013 crawler uses.
- Click OK in the Manage auditing and security log properties dialog box.
This information was pulled from the following technet article
http://support.microsoft.com/kb/2817731